Improvement in mill-staffs



W. DALE 8a T. EASTELL.

MILL-STAFF.

N0.177,Z13. Patented May 9,1876.

.JU lla ATTORNEYS N PETERS, PHOTD-LITHOGRPNER. WASHINGTON. D C.

UNITED STATES PATENT OFFICE.`

WILLIAM DALE AND THOMAS EASTELL, OF SOUTH TOLEDO, OHIO.q

IMPROVEMENT IN MILL-STAFFS.

Specification forming part of Letters Patent N o. 177,213, dated May 9, 1867; application filed April 1, 1876.

To all whom it may concern:

Be it known that we, WILLIAM DALE and THOMAS EAs'rELL, of South Toledo, in the tion of a longitudinal vertical sectional view of our mill-staff.

The nature of our invention consists in the construction and arrangement of a mill-staff for truing the face of mill-burs, as will be hereinafter more fully set forth.

In the annexed drawing; A represents the bed ring or foundation of the instrument made of cast-'iron planed on the under surface. The body of the instrument is composed of a ring, B, supports C, and elevated center plate D, all castin one piece, making it perfectly solid. The top plate D is provided witha center pin, a, and is to be turned perfectly smooth and level on its upper surface.l the pin being also turned in a lathe. Over this piu on the plate D is placed a circle, E, with armG cast in one piece, the eye of said circle fitting the pin or post a, and both top and bottoni of the plate or circle turned true. On the upper end of the post a is screw-threaded nut or cap H, to holdthe circle on the plate D. To the lower end of the arm G is, by set-screws d d, attached the staff J, which is made of wood, and kept true by a proof-stad, as are all other staffs. In the top of the staff J is inserted a spirit-level, I. The bed-ring A sits on the eye ofthe stone, the machine proper sits on this ring, and by means of set-screws h, through the ring B, the staff is raised off the face of the stone. These set-screws also, by aid of the spirit-level I, bring the machine to a perfeet level, however untrue the eye of the stone may be. The staff itself is fastened to the revolving arm Gr by the set-screws d, which serve to-bring the staff on a perfect level, as indicated by the level I in the body of the staff.

This machine will work on both runner and bed stone, as the table D of the machine is to be high enough to clear the top of the spindle. The machine is simple and easy in operation. When the machine is leveledl by a common spiritlevel ready for work, and the staff leveled and raised off the stone, it will at once show the highspots on the stone, which, be ing faced orf and again staffing, the stone can soon be brought in perfect. face. This stati' covers the Whole face of the stone in one revolution, and at once shows the face of the WILLIAM DALE.A THOMAS EASTELL. Witnesses:

I. C. HoL'r, E. W. EAs'rnLL. 

